Anything by the artist of Death Note.
Anything by the artist of Kuroshitsuji.
Clamp is pretty good too, though I don't like the stories themselves.
Katekyoushi Hitman Reborn's art is amazing, along with, of course, Bleach and Naruto.
Oh! Great is awesome too, especially action scenes.

I totally agree, on the top is The Bridge of the Water God, because there are drawn almost all details of backround and characters looks beautiful, not very "humans", but like the real legend. I love it.
Most of shoujo mangas are drawn really crappy, but i could give one exception - Skip Beat. Actually, drawing isn't very "wow", but it's very easy to understand the whole story, even acting is reached to that limit, that looks like the real thing. It's amazing, that author can show so much emotions, mimics, that's why it's my Nr. 1 most well drawn manga.
Well, there are totally many good drawn mangas. I could say, that lots of yaoi manga is not bad drawn (no idea why), and very sad, but lots of martial art mangas also well drawn (but I don't prefer those).

It seems to me that everyone is listing practically the same thing.....

Like Bleach, Naruto, VK, Clamp's manga, ect...

While I do like their art...They're not the best I've seen and it's fairly annoying to go through this board looking for things with good art and getting the EXACT same thing in almost half of the posts....

I won't say that these are unbeaten or my favorites(just stuff I have pics of) but I do like the art of:

Akagami no shirayukihime and all art by Akizuki Sorata:

Spoiler Alert! Click to show or hide

Most art by Fung Nga Chung like Alice's dream files and Lian ai make up...It not beautiful but it's adorable:

Spoiler Alert! Click to show or hide

Koko Ni Iru Yo(I know the pic is from a side story but the art is awesome!):

Here are some scans from Berserk. Miura's artwork is phenomenal. After more than twenty years with Berserk, Miura's art gets better and better, and his progression show. Berserk is highly detailed and remains one of the best drawn mangas out there, a true masterpiece.

i like perfect girl evolution/the wallflower very much! the drawings are , of course, fantastic... the plot is no where near the end, but its still really good!!! and bride of the water god is just too beautiful!!!!!!!!!!!!! :DDD